Bodyweight doesn't really do it. I brought my TRX straps so that's thebare minimum. There's no gym around... i think the eating is a large part of it, and i tend to pickup a cold damn near every time i travel.
Studies show that athletic men and women lose around 20% of muscle strength after 2 weeks of inactivity but do not visually see a difference. (It's more than 20% if your'e older than 30 or 40.) As long as you get in one workout every 2 weeks, you could maintain what you have.